I can translate his biography(I will do it thoroughly from 1917 and onwards for the sake of space):
Was born in a noble family. Participated in revolutionary work as a high school student, in 1912-1916 was educated in the Energetic Institute of St. Petersburg. In 1916 was taken in the army, and in August went to Ensign School(schools that would be responsible of giving a accelerated military education). In December for participation in revolutionary acitivity, he was expelled without receiving the rank of an ensign(he received it only in May 1917) and was sent to the 3rd Reserve infantry regiment in Petergof.
In 1917 propagandist of the Petrograd Committee of the RSDRP(Russian Social-Democratic Workers Party?), member of the RSDRP and the Revolutionary Committee of the Romanian Front. Lenin mentioned in one of his speeches ensign(junior lieutenant) Krusser that has been arrested for his speech in the troops on the front in Skulyana. From March 1918 he was a Commisar watching over the Inspector of Artillery of the 8th Army. From April 1918 he was the "Helper" of the Army Commander of the 5th Don Army. In September-October he served in the Voronezh Cheka, in November he became the head of the "Military Control" department of the staff of the 10th Army.
In 1919, secretary of the collegiate of the NkVD of Ukraine, member of the Supreme Revolutionary Tribunal of the Ukrainian SSR, People's Commissar of the Bessarabia SSR, then the People's Commissar on military affairs of the Bessarabia SSR(whose government was located in Odessa). Member of the Central Executive Commission of the Ukrainian SSR.
8 June 1919, after the removal of Makhno from command, the place of the commander of the 3rd Zadnepr( translates as beyond Dnepr) fusilier brigade was given to head of the military area Krusser. 9 June he issued an order proclaiming himself as the commander. Died on the night of 9-10 June 1919 when his armored train was caught under machine gun fire.
Comment: Magnificent example of the Red army commander: in the days of the Czar he couldn't make it to even the rank of an ensign, while in 1919 he became a head of a brigade! No military education whatsoever, but so much loyalty to the Red cause!